Industrial Automatic Control Systems and Controllers Annotation << Back Technical Means of Implementing Multi-level APCS O.V. Shishov Modern implementers of various levels of process control systems are defi ned. Stages of development of Supervisory Control and Data Acquisition (SCADA-systems) are allocated. The structure of the organization of interaction lower and top level means industrial control system is presented. Classifi cation of ORS-servers is carried out. Examples of OPC-servers of the domestic companies are given. Keywords: automated process control systems; programmable logic controllers; the SCADA-systems; OPC-servers. Contacts: E-mail: olegshishov@yandex.ru Pp. 22-26.